Districti of



( No Model.) 2 Sheets-Sheet 1Q G- R. COTTRELL. I APPARATU$ FOR MIXING GAS AND AIR.

Padzentad Mar THE NORRIS PETER; cu., WASHINGTON. n. c

(No Model.) 2 sheets-Sheena; V

G; R. GOTTRELLQ AHABATUS FORMIXING GAS AND AIR.

V/////////////////Afi;:7////// I/////////I////A Witnesses.-

rr-rs NORRIS mavens 1., WASHINGTON. n c.

U ITED STATES PATENT QFFICE',

(.w'f-EORGlCR. YFTRELL, OF NE\V YORK, N. Y.,"ASSIGNOR OF ONE-HALF TO \V. \V. DUDLEY AND FRANK C v lwROiVNE, OF UXSIIING'JTON, lllS'lRlQ l Ola UO'LUB ll HA.

APPARATUS, FOR MlXING GAS AND AIR.

SPECIFICATION forming 'part of Letters Patent No. 556,490, dated March- 17, 1896.

Application filed March 18, 1892.

To all whom .z't' may concern:

I Be it known that I, GEORGE R. COTIRELL, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Apparatus for Mixing-Gas and Air; and I do declare the following to be a fnll,'clear, and exact description. of 'the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying; drawings, and to the letters andnuinerals of reference marked which form a part of this specifica- 5 My present invention has refcienec to improvements in apparatus for mixing gas and air, andha's for its objectto produce a machine embodying simplicity of construction and operation, and in which the pressure of the gas alone is utilized as themotive power. My invention consists generally in a cylinder creasing inclosing two screw-drums, one for the gas and. one for the air, which. are simultaneously rotated by the action. of the pressure of the gas, the mixture of the gas and air being accomplished within the cylinder.

In the following description is set forth an apparatus embodying all the features of my present invention, and in which the construction, relative arrangement, and operation of the several parts constituting such apparatus will become apparent. 4

In the accompanying drawings, which form a part of this specification; Figure 1 represents an elevation of the apparatus; Fig. 2, a central longitudinal vertical section of the same; Fig. 3, a Vertical cross-section of the same; Fig. 4, the receiving end of the screwdrum for the gas; Fig. 5, the discharging end of the same, and showing .in dotted lines the positions of the openings in the discharging end of the.screwdrum for the air inrelation thereto; and Fig. (i is a detail of a section of I the gas-supply pipe with a pressure-regulator connected thereto...

eferring to the drawings, in which like letters and numerals or" reference refer to like parts in all the figures, the letter A. denotes the means. I two screw-drums, one-ofwhich, 1i, is-for the as shown.

cylinder or casing which contains the opera-t- Serial No. 425,471. (No models ing'mcchanisln, and which is mounted on standards or legs a or may be securedto'aii-"all or other upright by brackets or other preferred "Within this cylinder are arranged gas, and should preferably have a length equaljf to about one-fourth of the length of the screwdrum C for the air. These drums are mounted on a shaft (1 and are preferably arrangedeccentrically to the center oft'he cylinder in order to provide the greater "space at the top and furnish achainber of comparativelylarge area for the reception of the gas and air. The lower portion of the drums would in this event just clear the bottom. of the cylinder, and as this portion submerged .it is evident. that there could be no utility in prey-tiling a space .at this point.- 'By this arrangmnent also the amount of water to be displaced is .materially lessened. The shatltd is prefer- 7o ablysquaro in cross-section and is .journaled in cone-bearings arranged in the gas and air supply pipes at opposite ends of -the cylinder,

At the receiving end oif'cach drum is arrai'iged a casing e which beveled at its 7 5 periphery, as shown at e, to give greater space within. the cylinder and to offer as little resistance in its passage through the water as possible; These casin form chambers c which confine the air or gas, as the case may be, and deliver it to the receiving ends of the drums. The heads of the cylinder and easin are perforated to receive the gas and air supply pipes, which are of the elbow type and extend upward within the chambers e to 8 5 a point above-the water-level.

The drums are of similar construction to the drums shown and described in the patent granted to me March 3, 181)] and numbered 447,299, each of which being provided with a. series of spirally-arrangedcompartments,

the receiving ends of which are adjacent to the chambers c and the discharging ends terminating at the inner ends of the drums.

In the present instance, however, the spiral 9 5 compartments in the gas-drum are arranged in lines opposite to the lines of the co1npartments in the air-drum, and, as shown in Fig.

5, the discharging ends 1 of the forinerarc located at points midway between the dis? l-oo charging ends 2 of the latter. By this arrangement of the relative positions of the discharg in'g ends of the drums l attain a positive seal-v ing action in both drums, as it will be evident if the openings were arranged in lines coinci dent with each other the sealing action in both drums would be the same and at certain points the gas under pressure would have a clear passage through'both drums, and'this would be the case even when a portion ot'a compartment contained water, as the full pressure of the gas would tend to displace the water and escape from the apparatus.

I The drums are mounted and arranged in such a manner as that little or'no friction is produced in the operation, and the pressure of the gas alone is suihcient to cause said .drums to revolve and deliver the gas and air By this arrange-.

to the mixing-chamber. mcnt I dispense with the gearing and weight and other mechanisms heretofore employed and produce a' steady and constant rotation of the drums.

\Vater is supplied to a pipe f which is normally closed by a screw cap. g. This pipe extends within the cylinder and has a branch 7t arranged at a point coincident with the level the water properly assumes, and which is closed by, a cap 1'. \Vhen water is to be introduced. both caps the cylind er through are removed and water is fed until the water den reaches the level of the bran ch through which it flows and indicates that the proper amount has been supplied.

In Fig. 6 I have shown a device for reign-- lating the pressure of the gas from the main, and which consists of a perforated diaphragm is which has a central opening to admit a small rod Z, to which is connccteda disk valve 77L and a follower n. foiated and a pressure above normal operates to raise the follower and valve to partially close the openings in the diaphragm. ral spring 1 operates to keep the valve m normally opened, and, the spring when fully compressed operates as a stop to prevent the supply of gas being entirely out off. I I arrange on the casing of the air-drum a trip 0 which operates at each complete revolution of the drum to engage one tooth of a gear which is suitably mounted in the cylin- This gear operates by means of other suitable gearing a'set of dials which register the number of revolutions of-the drum and indicate the number of feet ofm-ixed air and gas which is discharged from. the apparatus. It is evident, however, that similar mechan ism could be employed in connection with the apparatus to measure or indicate the amount of gas or air which is supplied to the machine.

The operation of my improved apparatus is as follows: Water is first introduced into the cylinder until the predetermined level is reached. The gas is then turned on and supplied to the gas scrmv-drum, which is rotated -ercd at a low pressure.

The follower is also per-.

ply a steady and A spiby the pressure thereof and imparts motion to the air screw-drum through the shaft (I on which both drums are mounted. I The air and gas entering the s 'iiral compartments of: the: r respective drums discharged. therefrom when the p discharging ends, of the compartments above the level of the water, and the gas. and air passing to the upper portion of the cylinder are thoroughly. mixed and delivered by the out' let a; to the point or points of consumption.

The gas enters the compartments under full pressure from the maimbut leavesunder a comparatively low pressure created solely by the revolution of the drum in the watei and consequently the mixed gas and air is deliv:

By reason oi. the device employed in connection with the apparatus for registering the quantity. of gas or air or gas and air combined which passes through. the apparatus the necessity of employing a I gas-meter is obviated, .as my apparatus serves the double purpose of combining and mixing the gas and air and recording the quantity consumed.

The apparatus when constructed in accord ance with my invention is very simple in col)- struetion and may be cheaply made, as it my purpose to form the cylinder in two sections havin g flan ges, which are bolted togcth or when. the mechanism. isplaced. within the. same,'asshowii. I

The apparatus when'made is very comp act is neat and attractive in appearance and in -vicw of the simple construction and few parts is not likely to get out oi order.

As betorestated the pressure oi" the gas" alone serves as the motive power to rotate the drums, and by the employment a pressu'rercgulator in connection with the gas-supconstant operation and flow of mixed gas and air is the result.

I claim 1.. In an apparatus of the class described the combination with a cylindrical casing havrevolution of the drums brin the' ing an outlet-pipe for mixed air and gas, an} I I inlet-pipe for air, an inlet-pipe for gas, said. inlet-pipes arranged respectively at opposite ends of said casing and provided with journal-bearings, two drums mounted on a' single shaft. eccentrically in, said casing andupon said bearing,.eaeh of said drumsbeing di vided by means of a partition into two com partments, one of whichcompartments-com inunicating with the inlet-pipe for air and gas respectively, and the othercompartincut divided by spiral blades into suitable chambers and communicating with the inlet-compariment and having the discharge end of said spiral compartment provided with discharge-- openings, the discharge-openings of one drum being adjacent to but out of line with the discharge-openings of the other drums, substantially as described;

2. In an apparatus of the class described,

the eombinationwitha cylindrical easing con- In testimony whereof I afiix my signature mining screw-drums, of a water-supply 01' in presence of twn witnesses. filling pipe leading from the inlet in the top of the casing and extending flownward con- GEORGE R. GOTJTRELL.

5 c-entrically with the interior of the casing to a point near the base, an overflow branch in \Vitnesses: said pipe, and closures for the latter and the ARTHUR ln-zowxxxu,

v water-inlet. WILL '1. NORTON.

ion in Letters PatentdNo- 5 -It is hereby certifiedthat the name of the last-mentioned assignee in Letters "Patent No. 556,490, granted March- 17, 1896, upon the application of George R. Gottreil, of New York, N. Y., for an improvement in Apparatus for Mixing Gas and Air, was erroneously written and printed Frank G. Browne, Whereas said name should have been written and printed Frank L. Browne; and that the said Letters v Patent s honld'be read with this correction. therein that the same may-conform to the record of the case in the. Patent Ofiice.

Signed, conntereigned, and sealed this 24th de ty of March-A. D 1896.

[SEAL] JNO. M. REYNOLDS,

- v r Assistant Secretary of the Intem'or. Oountersigned': 'T I S. T. FISHER, 5

Commissioner of Patents. 

